Question

Fruit colour in squash is an example of _____________.

• A. Dominant epistasis
• B. Complementary genes
• C. Inhibitory genes
• D. Recessive epistasis.

Answer 1

The correct option is A Dominant epistasis

A.Dominant epistasis – Epistasis due to the dominant allele is called Dominant epistasis. Eg:Fruit colour of Summer squash.

B.Complementary gene – Two genes present on separate loci that interact together to produce a dominant phenotype is called Complementary gene. In the F₂ generation 9:7 ratio. Eg:Flower colour of Sweet pea.

C.Inhibitory genes - A gene which inhibits the expression of an active allele situated at different locus is called as inhibitory gene. Thus, in inhibitory gene action one dominant inhibitory gene prevents the expression of another dominant gene. eg: Rice leaf colour.

D.Recessive epistasis – Epistasis is due to homozygous recessive allele. Eg:mice body colour.

So, the correct option is ‘Dominant epistasis’.